If you are planing to upgrade your server with a new miraculous Quad core from AMD, codenamed Barcelona and if you want a multi socket machine, you might have an issue.
Barcelona, the first of many K10 chips won’t support HyperTransport 3 and this intercommunication protocol is suppose to speed up the inter chip communication and boost the multi chip system performance.
Well, Barcelona comes without it and approximately one quarter later, here comes the Budapest which will be a similar core, but with HyperTransport 3.0 support.